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GLU'IGHl MEGHANIS'M.

Patented Aug. 21,1833.v

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y UNITED STATES- PATENT OFFICE.

MICHAEL' KRAKER,OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF TIVO- THIRDS TO lli. ISRAEL AND OSCAR SCHMIDT, OF SAME PLACE.

CLUTCH MEoHAN|sM.f

SPECIFICATION forming' part 0f Letters Patent NO. 283,49?, dated August 21, 1883.

' Application filed June 5,1883. (No model.)

' To @ZZ/'whom' t may concern,.-

Be it known that I, MICHAEL KRAKER, of

, the city and county of San Francisco, Stateof --sists of a peculiar frictional attachment operating directly upon the needle-driving shaft, and a mechanism by which it may be applied or disengaged instantly, and without the'use of a treadle, as will be more fully explained by reference to the accompanying drawings, in which- Figure l is a perspective view'of the frietional device. Fig. 2 is a vertical section taken through the line of the shaft. Fig. 3 is a vertical section takenthrough the 'line of the shaft, showing a modiiication. Fig. 4 isa cross-section on the line y y, Fig. 2.

In establishments where sewing-machines are used in large numbers they are usually driven by power which is communicated through a shaft extending beneath the tables oi' the machines set inline, and the power is applied through a mechanism connecting with the shaft by a treadle beneath the machine. This is objectionable, because the space beneath the machine is sooccupied that it cannot be kept clean, and because, by applying the power to a shaft beneath the table and then having a belt from a wheel` upon this shaft to a pulley upon the shaft abovev the table, it takes longer to start and stop the machine, and it is not so manageable.

In my device, A is the table of a sewing-machine. B is the'arm above the table, supporting the needle-bar-operating mechanism and the shaft C, by which the needle is driven. This shaft passes out through the rear end of the arm B, and has a sleeve, D, iitted toit and extending beyond its end. This sleeve has a collar, E, through which set-screws F pass to secure it tothe shaft. Upon the sleeve D the hub G of the belt-pulley H turns freely', and the balance-wheel rim I is supported by arms from the belt-pulley, as shown, so as to turn with it. That part ofthe sleeve D which extends beyond the wheel-hub G is slotted upon opposite sides, and a short shaft, J, fits within it, having lugs l, projecting out through the slots to receive the curved elastic arms L,

'cannot come in contact with the rim of the wheel I. .This rim has surfaces turned upon it, against which the plates M may be forced, and when this is done these and thearins L,

lugs K, and through them the sleeve D,will be caused to rotate, thus driving the shaft C, to which the sleeve is fixed, as before described. The plates M, arms L, and shaft J are pressed inward against the pressure of the spring P by means of a bent lever, Q, having its fulcrum at R and one arm connected with the pin O, while the other extends down beneath the table, so that the operatormay press it to one side by moving the knee slightly, and thus force the plates M into contact with the constantly-movingfrim I. By this construction the most delicate control is obtained over the needle, and a single stitch, or any desired number, maybe made, as there is no momentum gained to continue the motion after the clutch has been released, because there are no heavy, parts connected with the shaft C to continue the motion.

Fig. 3 shows a modication of my device, in which the pin O moves a cone within the sleeve, and thus" acts upon pins connected with the spring-arms L, so aste force them outward and cause the shoes M to act.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a'sewing-machine, the means for comfz :ssamm municating motion to the needle-driving shaft, consisting of a continuously-running pulley, H, to which power is communicated, and a frictional rim, I, connected with said pulley, both turning loosely upon asleeve Which is fixed to said shaft, and arms so connected 'with the sleeve that they may be moved into con;

tact with the rotating wheel-rim, so as to be driven and carry with them the needle-driving shaft, substantially as herein described.

2. In a sewing-machine, a loosely-moving pulley, H, to which power is Connnunicated, a sleeve which is 4fixed to the needle-driving` shaft, and arms so connected with the sleeve that they may be moved into Contact With the pulley-rim, so as to set the sleeve and shaft in motion, in combination with a pressure-pin' J, and the elastic arms L, With their frictional o plates or shoes M, in combination With the pulley I, turning loosely upon the sleeve, and the pin O and lever Q, by which the shaft J is moved and the shoes brought into contact with the wheel-rim, substantially as herein described. y

4t. In a sewing-machine having the sleeve D iiXed to the shaft G and projecting beyond it, the wheel I, turning loosely upon said sleeve, and the arms L, having frictional shoes and connected with the sleeve, so as to turn with it and be moved to or from the wheel-rim, in combination With the pressure-pin O,by Which the shaft carrying the arm L may be forced in- Ward, and the retinning-spring l?, substantially as herein described.

In Witness whereof I have hereunto set my hand.

' MICHAEL KRAKER.

Vitnesses:

MoRRs MARCUsE, C. D. COLE. 

